답안 #697224

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
697224	2023-02-08T23:57:19 Z	allllekssssa	Hard route (IZhO17_road)	C++14	100 / 100	642 ms	128324 KB

road

#include<bits/stdc++.h>

using namespace std;

#define pb push_back
#define pii pair<int, int>

const int maxN = 1e6 + 10;

pii d[maxN];
long long ans;
long long ways = 1;
int n;
vector<int> v[maxN];


void dfs1(int x, int pred) {
    
    d[x] = {0, 1};
	for (int i: v[x]) {
		if (i != pred) {
			dfs1(i, x);
			if (d[i].first + 1 > d[x].first) {
				d[x] = {d[i].first + 1, d[i].second};
			} else {
				if (d[i].first + 1 == d[x].first) {
					d[x].second+=d[i].second;
				}
			}
		} 
	}
}

void dfs2(int x, int pred, pii bestUp) {
     
	vector<pii> choices;
    
    if (x != 1) {
      choices.pb(bestUp);
   }

	for (int i: v[x]) {
		if (i != pred) {
			choices.pb(d[i]);
		}
	}

	sort(choices.begin(), choices.end());
	reverse(choices.begin(), choices.end());
    

    if (choices.size() > 2) {

    	long long maxProduct = 1ll * (choices[0].first + 1) * (choices[1].first + choices[2].first + 2);

    	if (maxProduct  >= ans) {
    		long long pathCount = 0;

    		if (choices[1].first == choices[2].first) {
                
    			long long total = 0;
                long long removeSum = 0;
    			for (auto i: choices) {
    				if (choices[1].first == i.first) {
    					total+=i.second;
    					removeSum+= 1ll * i.second * i.second; 
    				}
    			}
                
    			pathCount = total * total - removeSum;
    			pathCount/=2;

    		} else {
    				if (choices[0].first == choices[1].first) {
                        
    				    long long total = 0;
    		        	for (auto i: choices) {
    				    	if (choices[2].first == i.first) {
    						  	total+=i.second;
  		  					}
    					}

    					pathCount =  total * (choices[0].second + choices[1].second);

    				} else {
    					 
    					 long long total = 0;
    		        	 for (auto i: choices) {
    				    	if (choices[2].first == i.first) {
    						  	total+=i.second;
  		  					}
    					}

    					pathCount = total * choices[1].second;
    				}
    		}

    		if (maxProduct == ans) ways+=pathCount; else {
    			ans = maxProduct;
    			ways = pathCount;
    		}
    	}
    }
    
    // leaf
    if (v[x].size() == 1 && pred) {
    	return;
    }
   

    int len = choices[0].first;
    int nacini = 0;
    int drugiNacini = 1;
    int drugiDuzina = -1;
    if (choices.size() > 1) {
    	drugiDuzina = choices[1].first;
    	drugiNacini = 0;
    }
    
    for (auto i: choices) {
    	if (i.first == len) nacini+=i.second;
    	if (choices.size() > 1 && drugiDuzina == i.first) drugiNacini+=i.second;
    }
    
	for (int i: v[x]) {
		if (i != pred) {
			if (d[i].first == len) {
				if (nacini - d[i].second != 0) {
				   dfs2(i, x, {len + 1, nacini - d[i].second});
				} else {
					dfs2(i, x, {drugiDuzina + 1, drugiNacini});
				}
			} else {
				dfs2(i, x, {len + 1, nacini});
			}
		}
	}
}

int main() {
    
    cin >> n;
   
    for (int i = 1; i<n; i++) {
    	int x, y;
    	scanf("%d%d", &x, &y);
    	v[x].pb(y);
    	v[y].pb(x);
    }


    dfs1(1, 0);

    dfs2(1, 0, {0, 0});
  
    cout << ans << " " << ways << endl;
	return 0;
}

Compilation message

road.cpp: In function 'int main()':
road.cpp:146:11: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  146 |      scanf("%d%d", &x, &y);
      |      ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
19.0 / 19.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	23764 KB	Output is correct
2	Correct	13 ms	23764 KB	Output is correct
3	Correct	12 ms	23736 KB	Output is correct
4	Correct	12 ms	23700 KB	Output is correct
5	Correct	12 ms	23764 KB	Output is correct
6	Correct	12 ms	23764 KB	Output is correct
7	Correct	12 ms	23764 KB	Output is correct
8	Correct	12 ms	23764 KB	Output is correct
9	Correct	12 ms	23696 KB	Output is correct
10	Correct	12 ms	23780 KB	Output is correct
11	Correct	12 ms	23796 KB	Output is correct
12	Correct	12 ms	23764 KB	Output is correct
13	Correct	13 ms	23712 KB	Output is correct
14	Correct	14 ms	23780 KB	Output is correct
15	Correct	12 ms	23752 KB	Output is correct
16	Correct	12 ms	23708 KB	Output is correct
17	Correct	12 ms	23764 KB	Output is correct
18	Correct	13 ms	23796 KB	Output is correct
19	Correct	13 ms	23796 KB	Output is correct
20	Correct	12 ms	23764 KB	Output is correct
21	Correct	12 ms	23792 KB	Output is correct
22	Correct	12 ms	23764 KB	Output is correct
23	Correct	13 ms	23796 KB	Output is correct
24	Correct	12 ms	23792 KB	Output is correct

Subtask #2
33.0 / 33.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	23764 KB	Output is correct
2	Correct	13 ms	23764 KB	Output is correct
3	Correct	12 ms	23736 KB	Output is correct
4	Correct	12 ms	23700 KB	Output is correct
5	Correct	12 ms	23764 KB	Output is correct
6	Correct	12 ms	23764 KB	Output is correct
7	Correct	12 ms	23764 KB	Output is correct
8	Correct	12 ms	23764 KB	Output is correct
9	Correct	12 ms	23696 KB	Output is correct
10	Correct	12 ms	23780 KB	Output is correct
11	Correct	12 ms	23796 KB	Output is correct
12	Correct	12 ms	23764 KB	Output is correct
13	Correct	13 ms	23712 KB	Output is correct
14	Correct	14 ms	23780 KB	Output is correct
15	Correct	12 ms	23752 KB	Output is correct
16	Correct	12 ms	23708 KB	Output is correct
17	Correct	12 ms	23764 KB	Output is correct
18	Correct	13 ms	23796 KB	Output is correct
19	Correct	13 ms	23796 KB	Output is correct
20	Correct	12 ms	23764 KB	Output is correct
21	Correct	12 ms	23792 KB	Output is correct
22	Correct	12 ms	23764 KB	Output is correct
23	Correct	13 ms	23796 KB	Output is correct
24	Correct	12 ms	23792 KB	Output is correct
25	Correct	15 ms	24192 KB	Output is correct
26	Correct	14 ms	24276 KB	Output is correct
27	Correct	15 ms	24392 KB	Output is correct
28	Correct	16 ms	24324 KB	Output is correct
29	Correct	15 ms	24316 KB	Output is correct
30	Correct	14 ms	24316 KB	Output is correct
31	Correct	16 ms	24320 KB	Output is correct
32	Correct	14 ms	24276 KB	Output is correct
33	Correct	14 ms	24316 KB	Output is correct
34	Correct	14 ms	24392 KB	Output is correct
35	Correct	14 ms	24364 KB	Output is correct
36	Correct	14 ms	24320 KB	Output is correct
37	Correct	15 ms	24396 KB	Output is correct
38	Correct	14 ms	24696 KB	Output is correct
39	Correct	14 ms	24276 KB	Output is correct
40	Correct	14 ms	24064 KB	Output is correct
41	Correct	14 ms	24056 KB	Output is correct
42	Correct	14 ms	24020 KB	Output is correct
43	Correct	18 ms	24020 KB	Output is correct
44	Correct	14 ms	24020 KB	Output is correct
45	Correct	14 ms	24020 KB	Output is correct
46	Correct	14 ms	23984 KB	Output is correct
47	Correct	14 ms	24004 KB	Output is correct
48	Correct	15 ms	24144 KB	Output is correct

Subtask #3
48.0 / 48.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	23764 KB	Output is correct
2	Correct	13 ms	23764 KB	Output is correct
3	Correct	12 ms	23736 KB	Output is correct
4	Correct	12 ms	23700 KB	Output is correct
5	Correct	12 ms	23764 KB	Output is correct
6	Correct	12 ms	23764 KB	Output is correct
7	Correct	12 ms	23764 KB	Output is correct
8	Correct	12 ms	23764 KB	Output is correct
9	Correct	12 ms	23696 KB	Output is correct
10	Correct	12 ms	23780 KB	Output is correct
11	Correct	12 ms	23796 KB	Output is correct
12	Correct	12 ms	23764 KB	Output is correct
13	Correct	13 ms	23712 KB	Output is correct
14	Correct	14 ms	23780 KB	Output is correct
15	Correct	12 ms	23752 KB	Output is correct
16	Correct	12 ms	23708 KB	Output is correct
17	Correct	12 ms	23764 KB	Output is correct
18	Correct	13 ms	23796 KB	Output is correct
19	Correct	13 ms	23796 KB	Output is correct
20	Correct	12 ms	23764 KB	Output is correct
21	Correct	12 ms	23792 KB	Output is correct
22	Correct	12 ms	23764 KB	Output is correct
23	Correct	13 ms	23796 KB	Output is correct
24	Correct	12 ms	23792 KB	Output is correct
25	Correct	15 ms	24192 KB	Output is correct
26	Correct	14 ms	24276 KB	Output is correct
27	Correct	15 ms	24392 KB	Output is correct
28	Correct	16 ms	24324 KB	Output is correct
29	Correct	15 ms	24316 KB	Output is correct
30	Correct	14 ms	24316 KB	Output is correct
31	Correct	16 ms	24320 KB	Output is correct
32	Correct	14 ms	24276 KB	Output is correct
33	Correct	14 ms	24316 KB	Output is correct
34	Correct	14 ms	24392 KB	Output is correct
35	Correct	14 ms	24364 KB	Output is correct
36	Correct	14 ms	24320 KB	Output is correct
37	Correct	15 ms	24396 KB	Output is correct
38	Correct	14 ms	24696 KB	Output is correct
39	Correct	14 ms	24276 KB	Output is correct
40	Correct	14 ms	24064 KB	Output is correct
41	Correct	14 ms	24056 KB	Output is correct
42	Correct	14 ms	24020 KB	Output is correct
43	Correct	18 ms	24020 KB	Output is correct
44	Correct	14 ms	24020 KB	Output is correct
45	Correct	14 ms	24020 KB	Output is correct
46	Correct	14 ms	23984 KB	Output is correct
47	Correct	14 ms	24004 KB	Output is correct
48	Correct	15 ms	24144 KB	Output is correct
49	Correct	444 ms	79704 KB	Output is correct
50	Correct	459 ms	85304 KB	Output is correct
51	Correct	467 ms	89900 KB	Output is correct
52	Correct	455 ms	73388 KB	Output is correct
53	Correct	405 ms	85416 KB	Output is correct
54	Correct	402 ms	91064 KB	Output is correct
55	Correct	387 ms	77204 KB	Output is correct
56	Correct	386 ms	83124 KB	Output is correct
57	Correct	422 ms	93196 KB	Output is correct
58	Correct	411 ms	86988 KB	Output is correct
59	Correct	429 ms	86948 KB	Output is correct
60	Correct	423 ms	84176 KB	Output is correct
61	Correct	627 ms	128324 KB	Output is correct
62	Correct	642 ms	114168 KB	Output is correct
63	Correct	621 ms	72992 KB	Output is correct
64	Correct	607 ms	63080 KB	Output is correct
65	Correct	636 ms	56652 KB	Output is correct
66	Correct	579 ms	53380 KB	Output is correct
67	Correct	570 ms	51664 KB	Output is correct
68	Correct	577 ms	51064 KB	Output is correct
69	Correct	559 ms	50736 KB	Output is correct
70	Correct	563 ms	50612 KB	Output is correct
71	Correct	575 ms	50540 KB	Output is correct
72	Correct	558 ms	50464 KB	Output is correct
73	Correct	603 ms	50780 KB	Output is correct
74	Correct	581 ms	50952 KB	Output is correct
75	Correct	552 ms	51276 KB	Output is correct
76	Correct	525 ms	51944 KB	Output is correct
77	Correct	463 ms	53440 KB	Output is correct
78	Correct	301 ms	56712 KB	Output is correct

답안 #697224

Compilation message

Subtask #1 19.0 / 19.0

Subtask #2 33.0 / 33.0

Subtask #3 48.0 / 48.0

Subtask #1
19.0 / 19.0

Subtask #2
33.0 / 33.0

Subtask #3
48.0 / 48.0